If your son or daughter mentions about listening fatigue, you might consider canadian speakers - paradigm atom, energy c-1, or axiom (www.axiomaudio.com) I liked the crispness of the B&W 302, but was worried about listening fatigue and went with a canadian softer sounding speakers. NHTs are also nice.
Let's see which one - the boy or the girl - ends up getting the better system for themselves later in life! You, however, will have a thoroughly clean conscience either way - Kudos and Three Cheers!